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One of those chemicals is benzene, formed from natural processes, such as volcanoes and forest fires, as well as from human activities

A couple covers

One chemical created by the heating of propylene glycerol is formaldehyde which at sufficient levels is possibly carcinogenic

BVC (Bottom Vertical Clearomizer): The common case with most modern BCCs, where the coils are in vertical alignment so as optimise airflow

A 2007 study of social smoking among college students -- one of very few that have been published on the subject -- found the term was used "loosely and inconsistently," even among researchers

doi:10.1016/j.hrtlng.2020.06.008